Visual Studio 2008 Beta 2, including Team Foundation Server 2008, is now available for download.  As mentioned in Soma's post, Beta 2, unlike beta 1, includes the "go live" provision in the license, meaning that you can use it in production.  We've been using TFS 2008 beta 2 on our main internal dogfood server now for the last two months (well, it's close to being the same as beta 2 -- it's actually an very early snapshot).  You can check out the stats in Brian's post.

When Beta 1 was released, I put together a list of links about the Team Build features in Orcas.  If you are looking for a list of links related to TFS 2005, you can find those here (and Jeff has posted links to the TechEd 2007 presentations).

Here's my updated list of links about Team Build features in TFS 2008 (check out Brian's post for a list of all TFS 2008 features).  If you have questions or feedback about anything in beta 2, please let us know (either here or in the forum).  We're anxious to hear what you think!

Overview of features in Build for TFS 2008

Demos

Vista Sidebar Gadgets to monitor builds (we're working on an equivlaent to CCTray)

Details on how things work, customizations, etc.

Object Model API

Using the API via PowerShell